site. Chloroflexi site. Chloroflexi The class of phylum was abundant at the geothermal site while the Anaerolineae class was more abundant at the biogenic site. Bacterial strains from the seepage pockmarks were isolated on a variety of selective media targeting bacteria with bioremediation potential. A total of 106 strains Proteobacteria Bacteroidetes were isolated and characterised, including representatives from the phyla , , Firmicutes Actinobacteria , and . This article describes the first microbial study on gas seepage pockmarks in Iceland.

Tian, Y., Wan, Y.-Y., Mu, H.-M., Dong, H.-L., Briggs, B.R., Zhang, Z.-H., 2020. Microbial diversity in high- temperature heavy oil reservoirs. Geomicrobiology Journal 37, 59-66.

https://doi.org/10.1080/01490451.2019.1662523 The microbial community in oil reservoirs plays important roles in carbon, sulfur, and nitrogen cycling. We identified the microbial composition, abundance, and diversity in two heavy oil wells (W1 and W2) located at Liaohe oilfield, China, that were flooded with higher temperatures, forming a decreasing gradient-temperature field (DGTF) from the steam chamber to the original surrounding formation. The two wells were connected to each other at a depth of 650 mand with temperatures of 249 °C (W1) and 259 °C (W2) in the steam chamber. Water and oil samples were collected from both wells, and 16S rRNA genes were sequenced using Illumina MiSeq (Illumina, San Diego, CA). The number of operational taxonomic units (OTUs) was 5499 and 5938 for W1 and W2, respectively, at 97% clustering. In both wells, the dominant bacterial phylum was Proteobacteria. Terrimonas Fluviicola Euryarchaeota and Crenarchaeota were the only two archaeal phyla detected. and were Thermomonas Nitrosomonas Sphingobacterium more abundant in the water sample W1 - W, whereas , , and were more abundant in the oil sample W2-O. Aquificae was the only phylum detected in these wells that had not been detected in other oilfields. Excluding exogenous contamination, the results of this study showed abundant in-situ microbial diversity. The heavy oil reservoir has a large DGTF in higher temperature heavy oil reservoirs, potentially affecting the inner environment.

Tomczyk, J., Regulski, P., Lisowska-Gaczorek, A., Szostek, K., 2020. Dental caries and stable isotopes analyses in the reconstruction of diet in Mesolithic (6815 - 5900 BC) individuals from Northeastern Poland. Journal of Archaeological Science: Reports 29, 102141.

http://www.sciencedirect.com/science/article/pii/S2352409X19306017 The aim of this study was to assess carious lesions in Mesolithic individuals from Northeastern Poland and interpret them in the context of the paleo-diet, using physicochemical analyses. The dental material came from two Mesolithic sites in Northeastern Poland, Pierkunowo- Giżycko and Woźna Wieś. The study focused on four individuals from the Mesolithic period (two adults and two children) with a total of 34 teeth (16 deciduous, 18 permanent teeth). The relationship between the results of the dental caries study and the paleo-diet was examined using stable carbon and nitrogen isotopic analysis. Superficial dental caries was found on only five teeth (from three individuals): four permanent and one deciduous molar. In all cases, the dental caries was located on the occlusal surface. The nitrogen isotopic ratios 15 (δ N) of the individuals were on average 8‰ higher than the values obtained for local herbivorous animals. Increased values of isotopic nitrogen ratios were probably associated with the consumption of organisms from 15 higher trophic levels, such as predatory freshwater fish. It should be noted that the δ N of fish from the Mesolithic and Neolithic periods (from 12 to 13‰) was similar to that obtained for the studied individuals. It can be concluded that the paleo-diet of the test individuals was probably based largely on freshwater fish. This kind of diet, even with the participation of other cariogenic products, could have significantly slowed down the development of caries in the examined individuals.

Toner, J.D., Catling, D.C., 2020. A carbonate-rich lake solution to the phosphate problem of the origin of life. Proceedings of the National Academy of Sciences 117, 883-888.